Slitting means



April 1935. R, McC. JOHNSTONE 1,998,929

SLITTING MEANS Fil ul 21. 195 2 SheetsSheet 1 INV ELTOR. m /W W A TTORNEY.

A ril 23, 1935.

R. Mccj JOHNSTONE SLITTING MEANS Filed July 21, 1934 2 Sheets-Sheet 2 ATTORNEY.

Patented Apr. 23, 1935 UNITED s TAT s PATENT OFFICE surrme MEANS 7Robert M00. Johnstone, Short Hills, N. 1., assignor to Cameron MachineCompany, Brooklyn, N. Y., a corporation of New York Application 21,1934, Serial No. 736,283

12 Claims.

heretofore used.

In the accompanying drawings the invention is shown in several concreteand preferred em-' bodiments in which Fig. 1 is a view partly in sideelevation and part ly in section of slitting means showing one form ofthe invention;

Fig. 2 is a fragmentary vertical sectional view substantially on theplane of line 2-4 of Fig. 1;

Fig. 3 is a view similar to Fig. 2 showing a modifled form of theinvention; I

Fig. 4. is a view similar to Fig. 1 showing still another modificationof the invention;

Fig. 5 is a view looking in the direction of arrow -5 of Fig. 1; and

Fig. 6 is a view looking in the direction of arrow 6 of Fig. 5.

. I 0 indicates a backing member in the form of a rotatable smooth-faceroller having a glasshard surface with which cooperates a rotatablescore-cut slitter il in suchmanner that, when a web of flexible materialis passed between the .two elements, said material is slitted lengthwisein accordance with well-blown practice. I Referring to Figs. 1, 2 and 5,the score-cutter 1s confined between side cheeks l2, of a slitter holderi3, provided with slots it having an enlarged lower portion i5, and intothese slots fit shouldered studs i6, so that the slitter is rotatablyand slidably carried.

In the normal'operation of a score-cut slitting device the cutting edgeacts against the material to be slitted and the score-cut slitterpenetrates the web and presses against the platen roll or' backingmember that supports the web; the slitting operation occurring by therotation of the platen roll and the score-cut slitter. It is evidenttherefore that the score-cut slitter should have a correct profile forsatisfactory action, and that in the operation of the mechanism whichoccurs with a'rolling action under pressure, there will be somedistortionand change of shape of the slitter edge. The reconditioningdevice, consisting of a grooved roller ll, engages the cutting edge i8of the slitter, and the profile of the groove ,in the reconditioningroller being the correct.

profile of the slitter, it will be seen that the continued engagementofthe reconditioning roller with cutting'edge iii of slitter I lwill rollthe edge on the slitter back to its correct shape, overcoming to a majorextent the deformation of the slitter profile caused by its rollingengagement with the platen roll. Roller I1 is mounted by anti-frictionmeans (not shown) on a carrier here in the form of a lever I 9pivoted-at 20' on .the slitter holder. The free end of lever 19 carries5 an. adjustable screw 2| against which bears an expansion spring 22anchored on bracket 23 of the slitter holder. It will now be seen that,as slitting takes place, the slitter engages the grooved roller and hasits cutting edge simultane- 1 ous'ly reconditioned. It will be apparentthat the reconditioning device need not be the only means that supportsthe slitter-to keep it against the backing member, and therefore thatthe tension of spring 22 need not be depended upon to exert cuttingpressure as between the slitter and the backing member. In the presentinstance, however, it is preferred. to have the reconditioning device asthe sole supporting means for the slitter n and said spring is thereforeof such character as to exert cutting pressure. The advantage of havingthe spring exercise this double function will be understood when theremaining elements of the slitter mounting are considered. As hereshown, slitter holder I3 is carried on a rail or support 24 havinginclined facesas shown to which said holder is clamped by means of bolt25 and on which it can be adjusted lengthwise. Rail 24 usually carries anumber of slitter holders and is supported by one or more arms 26mounted loosely on shaft 21, that is mounted in eccentric bearings 21a.28 indicates a pair of toggles pivoted at 29 on the framework andconnected at 29a to the slitter holder. 30 indicates a positive stop onthe framework and 3| is a handle for operating the toggles. Shaft '21carries a handle 21b and also a ratchet 21c-with which engages a pawl21d. To cause the slitter to engage the backing member, the toggles arefirst straightened and brought against stop 30, this part'of theoperation causing the slitter to be moved adjacent to or barely touchingthe backing member. Handle 21b is now operated to turn shaft .21 in itseccentric bearings therebyrotating ratchet 21b after which the pawl isplaced in engagement with the ratchet. Thisbrings the slitter intocutting engagement with the backing member. As a rule several slittingelements are associated with backing member ID being-all mounted on rail24 and r in order to compensate for unequal wear of the slitters, so asto obtain uniform cutting pressure of all the slitters, springs 22 ofthe diiferent slitters will be unequally adjusted. 'If it is nownece'ssary to disengage the slitters with backing member l0, handle 3|is operated in a direction brought back until they strike stop 30.

reverse to that previously described, and it will be observed that whenthereaiter restoring. the slitters to engagement with the backing memberexactly the same cutting pressure as before will be obtained withoutrequiring any adjustment of springs 22 because the position of shaft 21has not been disturbed and the toggles will always be with which theslitter can be removed will also be noted for, after breaking thetoggles, it is only necessary to move the slitter down to enlargedportion l5 of slot l4 when the shoulder stud Hi can be pushed sidewisethereby releasing the slitter. I

It is not necessary in all cases to employ roller l! as a reconditioningmember; thus, in Fig. 3, roller Ila is shownsmooth faced and acts merelyas a supporting member to engage the periphery of the slitter.

In Fig. 4 is found a modification of the invention. In this case aplurality of rollers llb are employed forming a cradle for the supportof the slitter, and it will be noted that, when this construction isemployed, it is no longer necessary to employ a slot like H or ashouldered stud as I6 of Figs. 1 and 2 because the two rollers I'Ibtogether with side cheeks l2b form adequate supporting and guidingmeans. Rollers I'Ib can be either grooved as in Fig. 2 or smooth facedas in Fig. 3.

I claim:

1. slitting means including: a backing member; a rotatable score-cutslitterto rotatively engage said backing member; and a reconditioningdevice to engage the cutting edge of the: slitter when the latterengages the backing member whereby when the slitter is rotated againstthe backing member to slit material its cuttin edge is simultaneouslyreconditioned.

2. slitting means including: a backing member; a rotatable score-cutslitter to rotatively engage said backing member; and rotatablepressure-exerting means to engage the periphery of the slitter to holdsaid slitter under cutting pressure against said backing member.

3. slitting means including: a backing member; a rotatable score-cutslitter to rotatively engage said backing member; and a rotatablereconditioning device 'having a circumferential groove for the receptionof the cutting edge of the slitter when the latter engages the backingmem ber whereby when the slitter is rotated against the backing memberto slit material its cutting edge is simultaneously reconditioned.

4. Slitting means including: a backing member; a rotatable score-cutslitter to rotatively engage said backing member; and a combinedpressure-exerting and reconditioning device, rotatably mounted, toengage the cutting edge of the slitter to hold said slitter undercutting pressure against said backing member.

5. slitting means including: a-backing member; a slitter holder; ascore-cut slitter, to engage the backing member, slidingly androtatively carried by the slitter holder; and rotatablepressure-exerting means to engage the periphery of the slitter to holdsaid slitter under cutting pressure against the backing member.

6. slitting means including: a backing mem- The ease ber; a slitterholder; a score-cut slitter, to engage the backing member, slidingly androta-, tively carried by the slitter holder; and a combinedpressure-exerting and reconditioning device, rotatively mounted, toengage the cutting edge of the slitter to hold said slitter undercutting pressure against the backing member.

7 slitting means including: a backing member; a slitter holder; ascore-cut slitter, to engage the backing member, slidingly androtatively carried by the slitter holder; a plurality of rotatablerollers forming a cradle to support the slitter against the backingmember by engaging the periphery of the slitter; and a pressure-exertingcarrier for the rollers to hold, through the rollers, the slitter withcutting pressure against the backing member. a

8. slitting means including: a backing member; a slitter holder; ascore-cut slitter, to engage the backing member, slidingly androtatively carried by the slitter holder; a plurality of rotatablereconditioning rollers forming a cradle to support the slitter againstthe backing mem-- her by engaging the cutting edge of the slitter; and apressure-exerting carrier for the rollers to hold, through'the rollers,the slitter with cutting pressure against the backing member, wherebythe slitter is also reconditioned by the rollers when slitting againstthe backing member. 9. slitting means including: a backing member; aslitter holder; a score-cut slitter rotatably carried by the slitterholder; adjustable pressureexerting means for the slitter; aneccentrically and adjustably mounted shalt carrying the slitter holder;and means to turn the slitter holder on the eccentrically mounted shaft.

10. slitting means including: a backing member; a slitter holder ascore-cut slitter rotatably carried by the slitter holder; adjustablepressure exerting means for the slitter; an eccentrically and adjustablymounted shaft carrying the slitter holder; and a pair of toggles to turnthe slitter holder on the eccentrically mounted shaft.

11. Slitting means including: a backing member; a support; a slitterholder adjustable lengthwise on the support; a score-cut slitterrotatably carried by the slitter holder; adjustable pressure-exertingmeans for the slitter; adjustable means to move the support, and therebythe slitter holder, toward and away from the backing member; and asecondmeans to move the support, and thereby the slitter holder, toward andaway from the backing member, without disturbing the adjustment of the'first means for moving the support.

12. slitting means including: a backing member; a support; a pluralityoi. slitter holders carried by the support; a score-cut slitterrotatably carried by each slitter holder; adjustable pressure-exertingmeans for each slitter; adjustable,

means to move the support, and thereby the plurality of slitter holders,toward and away from the backing member; and a second means to move thesupport. and thereby the plurality of slitter holders, toward and awayirom the backing member, without disturbing the adjustment of the firstmeans for moving the support.

ROBERT McC. JOHNSTONE.

